<p>I agree with WildWood. A much better indicator would be the number of people taking organic chemistry, a pre-med requirement. Given that nearly everyone who takes second-semester orgo is either pre-med or a chem major, this should provide a much better estimate. There were 197 students in orgo II in '10 and 188 in '09, so there is no way Princeton has 400 pre-meds per year. Or, judging from the fact that physics 102 is nearly exclusively pre-meds (yes, some pre-meds take 104, but 104 is mostly engineers) and is noticeably smaller (~100 per year) I wouldn’t be surprised if the number of intended pre-meds per freshman class fell way south of 150.</p>